.frm

.myd

.myi

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insert delayted?

show variables like '%delayed%'

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lock?

　　read,

　　write,

　　read local

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pointer

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優先級

low_priovity

height_priovity

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導出數據到文件

select * from t1 into outfile '/data.data' fields terminated by ',' enclosed by '"';

load data in file?

load data infile '/data.data' into table t2 fields terminated by ',' enclosed by '"';

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行格式: dynamic,fixed,compressed

決定于行包含的數據類型.

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hexdump -C /data/t.MYD

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對于 fix 行格式的表,手工錄入的數據需要做如下處理

check table t;

optimize table t;

repair table t;

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動態行格式,如果行太長的話還存在行遷移.遷移

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SELECT[ALL | DISTINCT | DISTINCTROW ][HIGH_PRIORITY][STRAIGHT_JOIN][SQL_SMALL_RESULT] [SQL_BIG_RESULT] [SQL_BUFFER_RESULT][SQL_CACHE | SQL_NO_CACHE] [SQL_CALC_FOUND_ROWS]select_expr [, select_expr ...][FROM table_references[PARTITION partition_list][WHERE where_condition][GROUP BY {col_name | expr | position}[ASC | DESC], ... [WITH ROLLUP]][HAVING where_condition][ORDER BY {col_name | expr | position}[ASC | DESC], ...][LIMIT {[offset,] row_count | row_count OFFSET offset}][PROCEDURE procedure_name(argument_list)][INTO OUTFILE 'file_name'[CHARACTER SET charset_name]export_options| INTO DUMPFILE 'file_name'| INTO var_name [, var_name]][FOR UPDATE | LOCK IN SHARE MODE]]

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LOAD DATA [LOW_PRIORITY | CONCURRENT] [LOCAL] INFILE 'file_name'[REPLACE | IGNORE]INTO TABLE tbl_name[PARTITION (partition_name,...)][CHARACTER SET charset_name][{FIELDS | COLUMNS}[TERMINATED BY 'string'][[OPTIONALLY] ENCLOSED BY 'char'][ESCAPED BY 'char']][LINES[STARTING BY 'string'][TERMINATED BY 'string']][IGNORE number {LINES | ROWS}][(col_name_or_user_var,...)][SET col_name = expr,...]

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轉載于:https://www.cnblogs.com/mjorcen/p/4059751.html

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